Textiles: manufacturing – Thread finishing – Surface modification of running length
Patent
1991-05-02
1992-08-25
Schroeder, Werner H.
Textiles: manufacturing
Thread finishing
Surface modification of running length
28273, 28274, 28275, 28254, D02G 116, D02G 112, D02J 108
Patent
active
051407299
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for blow-texturing at least one multifilament yarn, with a guide unit containing a through bore having a conical section on one inlet side, and with a needle unit containing a through yarn passage aligned approximately coaxially with the bore of the guide unit, this needle unit extending with one end into the aforementioned conical section and exhibiting on this end a conical peripheral surface forming, with the wall of the conical section, a passage slot for a blowing medium; a feed bore for the blowing medium terminates upstream of the passage slot into the annular chamber surrounding the needle unit, and a baffle unit is mounted on the outlet side of the bore of the guide unit.
For obtaining a satisfactory texturing effect in such a device, a high overfeed is necessary. Overfeed means the ratio between the velocity of the yarn fed through the yarn passage and the take-off speed of the textured yarn exiting from the bore of the guide unit and deflected on the baffle unit. In order to provide for a high overfeed, the passage slot for the blowing medium between the needle unit and the guide unit should, in dependence upon the titer of the yarn, have in each case a predetermined width ranging from about 0.12 to 0.4 mm. With a given yarn titer, the width of the passage slot should always exhibit constantly its optimum value. The precision required for this purpose is, however, difficult to obtain and must be permanently maintained.
Therefore, in known devices of the type discussed hereinabove, the guide unit and/or the needle unit are arranged in an axially adjustable fashion in a housing of the device in order to be able to adjust the width of the passage slot by axial shifting. However, it is practically impossible with these devices to set the width of the passage slot accurately and in a reproducible way to a desired value. Furthermore, there is the danger that the adjustment will change during the course of time.
In general, the invention has the object of fashioning the above-indicated device in such a way that a high and uniform texturing quality is achieved and is also permanently ensured over relatively long periods of time.
In the device according to this invention, the object has been attained by fixing the axial position of the guide unit with respect to the needle unit by urging the guide unit and the needle unit against each other by a force exerted in the axial direction.
The invention thus eliminates the feature of making the guide unit and the needle unit axially adjustable with respect to each other and instead presses the two units against each other with a preferably elastic load of a predetermined magnitude. The result perforce achieved thereby is a passage slot of a predetermined, constant width between the needle unit and the guide unit. Furthermore, it is possible without difficulties to retain the two bodies so that the wall of the conical section of the bore in the guide unit and the conical peripheral surface on the needle unit are exactly coaxial to each other.
For similar reasons of precision and stability, the baffle unit preferably cannot be axially adjusted with respect to the guide unit, either, in order to be able to set the distance between the exit orifice of the bore of the guide unit and the baffle unit. Instead, the baffle unit can be mounted to a holder to be exchangeable and furthermore to be pivotable into a threading position remote from the exit orifice of the bore of the guide unit.
Embodiments of the device according to this invention will be described below with reference to the drawings wherein:
FIG. 1 is a schematic longitudinal section through a blow-texturing device,
FIG. 2 shows a longitudinal section through the device rotated by 90.degree. with respect to FIG. 1,
FIG. 3 is a cross section along line III-III in FIG. 1,
FIG. 4 is a cross section along line IV-IV in FIG. 1,
FIG. 5 shows, in a view corresponding to a detail of FIG. 1, a variation of the device on an
FIG. 6 shows a cross section along line VI-VI in FIG. 5,
FIG
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patent: 4041583 (1977-08-01), Hart et al.
patent: 4107828 (1978-08-01), Clendening, Jr. et al.
patent: 4667380 (1987-05-01), Symon
patent: 4922593 (1990-05-01), Gorrafa
Heberlein Maschinenfabrik AG
Mohanty Bibhu
Schroeder Werner H.
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